My suggestion is that the Forchbahn railway should be included in Train Sim World; that would be cool if it were to come.
I live in Switzerland and am familiar with the Forchbahn railway, so you won't be able to make anyone happy with that in TSW. I don't know what it's like today, but in the past it was a single-track line along its entire length, and normally only one type of train ran back and forth, without much variety.